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 Canon EF 17-40MM Ff/4L USM Lens US $590.00 
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 Canon EF 17-40mm f/4 L USM Lens Empty Box US $35.00
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 EW-83E EW83E Lens Hood for Canon EF 17-40mm f/4L USM US $3.60
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 EW-83E EW83E Lens Hood Canon EF 17-40mm 17-35mm 20-35mm US $3.75
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 Lens Hood EW-83E for Canon EF 16-35 17-35 17-40 20-35 US $4.00
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 Canon EF 17-40mm f/4L USM Ultra Wide Zoom Lens US $779.00
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 Canon EF 17-40mm/4.0 USM Lens Mint +++++ US $799.95
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 EF Canon 17-40mm f4L IS zoom lens US $775.00
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 New Canon EW-83E EW83E Lens Hood for EF 16-35mm f/2.8L 17-40mm f/4L EF-S 10-22mm US $39.26
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 Tiffen 77mm CPL + UV Filter + Hood For Canon EF 17-40mm US $66.95
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 Canon EF 17-40mm f4 L USM Zoom Ultrasonic lens, NICE! US $501.03
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 Canon EF 17-40mm F/4.0 L USM Lens and Extras US $550.00
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 Lens Hood bayonet Mount EW-83E for Canon EF 17-40mm 16-35mm 10-22mm 20-35 17-35 US $6.99
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 Tulip Flower Lens Hood for Canon EF 70-200mm 17-40mm US $11.99
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 77MM CPL UV FD Filter Kit Set FOR Canon EF 17-40mm lens US $25.74
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 Petal Lens Hood Shade EW-83E for Canon EF 17-40mm f/4L USM US $9.74
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 Petal Lens Hood for Canon EF 10-22/16-35/17-40 mm EW-83E EW83E US $9.74
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 New Canon EF 17-40mm f4L USM Wide Angle Zoom Lens US $839.99
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 Lens Hood for Canon EW-83E EF 16-35mm 17-40mm 10-22mm US $6.99
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 NEW Canon ultrasonic EF 17-40mm F/4L USM with Lens Case LP1319 & Hood EW-83E US $599.00
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 BK 6.Filter 77mm For Canon EF 24mm f/1.4 17-40mm 10-22mm 24-105mm 24-70mm Lens US $33.68
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 Canon EF 17-40 mm f/4L USM lens US $500.00
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 CANON EF 17-40MM F4.0 L USM LENS FIXED SLEEVE BARREL ASSEMBLY NEW AUTHENTIC OEM US $44.00
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 CANON EF 17-40mm f/4.0 L USM LENS US $419.22
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 Canon EF 17-40mm f/4L USM f4L f/4 f4 for 60D 5D2 #L001 US $848.00
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 Lens Cap with Tether for Canon EF-S 10-22mm 17-40mm 17-55mm USM Lens US $16.16
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 Lens Hood for Canon EF 17-40mm f/4 L USM 83E US $14.95
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 Bayonet Mount EW-83E Lens Hood for Canon EF 17-40mm f/4L USM US $7.08
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 Lens Hood Shade EW-83E for Canon EF 17-40mm f/4L USM US $9.95
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 Lens Hood for Canon EF 10-22/16-35/17-40 EW-83E EW83E US $9.95
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 CANON EMPTY BOX ONLY: Canon 35mm, 85mm, 70-200mm, 24-70mm, 16-35mm, 50 Canon Box US $30.00
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 NEW Canon 17-40mm F/4 F4 EF-L USM 17-40 ship by FedEx US $798.25
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 Canon EF 17-40mm 17-40 F4 f/4 L USM Lens -0227 US $822.00
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 EW-83E Lens Hood for Canon EF 17-40mm 17-35mm 10-22m 20-35mm US $8.71
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 CANON EF 17-40mm 1:4L USM REAR MOUNT METAL NEW ORIGINAL US $60.00
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 Sheepskin Leather Lens Case Canon EF 17-40mm f/4L USM US $17.50
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 Kenko 77mm Zeta Super MC UV Filter for Canon EF 17-40mm f/4L USM US $64.99
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 NEW! Canon EF 17-40mm f/4L USM Lens + Kit US $839.95
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 Low Price*Canon EF17-40mm 17-40 F4 f/4 L USM Lens -0227 US $822.00
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 77MM UV FILTER FOR CANON EF 24-105,S10-22,17-40,70-200 F/2.8L US $8.95
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 77mm Multi Coated UV Filter for Canon EF 24-105 EFS 10-22 17-40 70-200 F/2.8L US $6.69
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 HOYA 77mm UV for canon lens EF 100-400mm f/4.5-5.6L 17-40mm f/4L 70-200mm f/2.8L US $39.90
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 Canon EF 17-40mm F/4 L USM for 550D 600D 7D 60D 5D 50D 5D II (NEW) + GIFT US $895.00
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 EW83E EW-83E bayonet Lens Hood Shade Replace f Canon EF 17-40mm 17-35mm 20-35mm US $4.26
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 EW-83E Lens Hood for Canon EF 17-40mm 17-35mm 20-35mm US $4.79
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 Lens Hood fits Canon EF 10-22 16-35 17-40mm USM EW-83E US $10.49
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 S2869 New Canon EOS 550D Body DSLR +EF 17-40mm F4.0L +1Year Warranty US $1,430.23
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 CANON EF 17-40 f/4L Wide angle zoom-MINT US $.99
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 77mm High quality professional filter lens kit for Canon Ef 24-105mm 17-40mm US $24.99
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 CANON EF 17-40mm 4 L USM LENS RUBBER DUST SHIELD NEW US $22.00
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 Close Up Macro Filter Set for Canon EF-S 10-22mm 17-40mm 17-55mm USM LENS US $58.58
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 EW-83E Lens Hood for Canon EF 17-40 10-20 16-35 17-35 lens ew83e ew 83 e US $4.99
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 Lens Hood EW-83E for Canon EF 17-40mm f/4L USM US $8.50
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 EW-83E Lens Hood for Canon EF 17-40 10-20 16-35 17-35 US $3.75
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 New Canon EF 17-40mm f/4L USM + USA Canada Warranty + 77mm UV + Gifts by Express US $853.39
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 77MM UV + CPL FILTER FOR CANON EF 24-105,S10-22,17-40,70-200 F/2.8L US $12.95
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 Test Chart for Canon EF 17-40mm f/4 L USM Lens & Camera US $11.95
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 Excellent+ Canon EF 17-40 F/4L USM Lens for Canon EOS 60D 5D 7D 50D T3i T2i 10D US $749.99
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 Canon EF 17-40mm 17-40 f/4 F4 L USM Lens-Brand New-PXJC US $822.00
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 Canon EF 17-40mm 17-40 f/4 F4 L USM+77mm UV Filter-9MTI US $859.00
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 EW-83E Lens Hood for Canon EF 17-40mm f/4L USM EW83E US $3.75
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 UV ULTRAVIOLET FILTER LENS PROTECTOR FOR CANON EF 17-40mm f/4L USM + CAP KEEPER US $11.95
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 Lens Hood for Canon EF 17-40 10-20 16-35 17-35 EW-83E F US $9.33
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 Brand New Canon EF 17-40mm f/4L USM affordable Ultrasonic Wide Angle Zoom lens US $824.99
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 CANON EF 17-40MM 1.4 L ZOOM RING NEW LENS REPAIR PART US $16.40
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 Canon EF 17-40mm F/4.0 L USM Lens 17-40 f4 f4.0 MINT Retail USA US $819.95
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 Canon EF EOS 17-40 f4 L Lens boxed with everything. 5D 7D 50D 60D 40D US $709.99
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 Pro size 77mm UV +CPL Filters for CANON EF 17-40mm f/4L US $26.95
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 Large Test Chart for Canon EF 17-40mm f/4 L USM Lens US $27.95
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 77mm NEW LENS HOOD for Canon EF 17-40/4L USM US $8.95
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 Canon Lens EF 17-40mm F4L USM Instruction Manual: Original; Multi-Lang. US $12.90
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 Lens Hood for EW-83E Canon EF 17-40mm f4 20-35mm f3.5-4.5 16-35mm f2.8 II USM US $6.77
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 Canon EF 17-40mm f/4 L USM Lens f4 for 1D Mark IV 4 5D II + Kenko 77mm UV&CPL US $856.79
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 Canon EF 17-40mm f/4 L USM Lens f4 for 5D 600D 60D 7D 550D ~No Hidden Cost to US US $814.79
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 Canon EF 17-40mm f/4 L USM Lens f4 for Kiss X4 X5 Rebel T2i T3i + Kenko 77mm UV US $825.29
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 VossDiGi EW-83E EW 83E Lens Hood (NEW) for Canon EF-S 10-22mm EF 17-40mm 16-35mm US $18.95
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 CANON EF 17-40MM 1:4 L USM AF AUTO FOCUS MOTOR UNIT NEW REPAIR PART US $105.00
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 77mm Wide/Zoom Lens Hood for Canon EF 17-40mm f/4.0L US $7.95
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 Hoya HMC 77mm UV Haze Filter For Canon EF 17-40mm Lens US $52.99
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 Hoya HMC 77mm UV Filter + Blower For Canon EF 17-40mm US $52.99
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 Tiffen 77mm CPL + UV Filter For Canon EF 17-40mm Lens US $66.95
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 Tiffen 77mm UV Filter For Canon EF 17-40mm + Lens Hood US $31.95
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 10pcs set EW-83E EW83E Lens Hood for Canon EF 17-40mm f/4L USM US $36.00
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 77MM CPL FILTER FOR CANON EF 24-105MM,EF-S10-22MM,17-40MM,70-200MM F/2.8L US $6.95
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Canon EF 17-40
CANON 17-40 mm f/4 L USM Lens - Unboxing & Review:
Prime Lens Vs Zoom Lens – Which Is Best?
So, you’re wanting to get a new lens, but you’re not quite sure whether to buy a prime lens or a zoom lens. Both types of lenses have their advantages and disadvantages, and you want to make sure you make the right decision and get the lens which best fits your photographic needs.
In case you didn't already know, the main difference between a zoom lens and prime lens is that a zoom lens enables you to adjust your focal length within a certain range (for example 18-50mm), whereas a prime lens has a fixed focal length.
So you might be wondering what the point is of using a prime lens. Surely if you have the choice between a lens with flexibility and one with no flexibility, then surely the flexible one is the best one, isn’t it? Well, it’s not really as straightforward as that, because prime lenses do have some advantages. To begin with, they are lighter than zoom lenses because they have less moving parts. Mechanically speaking, they are simpler.
In addition to this, prime lenses usually have wider apertures. The aperture of a lens determines how much light the lens lets in at any one time. Aperture ratings are in ratios, for example 1:3.5 or 1:2.8, but usually when buying a lens you will see it shown without the 1 in front of it, for example 3.5. Lenses with lower aperture numbers are more expensive, as a lower number means a wider aperture. Having a wide aperture produces a shallow depth of field, meaning that only a small distance range is in focus. A narrow depth of field (a wide aperture) would be great for close-ups of flowers where you want the background blurred, whereas a large depth-of-field (a small aperture) would be ideal for landscape photos.
Okay, so how about the zoom lens?
Well, a zoom lens will give you a bigger range of distances to compose your image. This means that you don't need to move closer or further away from your subject to get the picture you're after. It can also be great for taking shots of wildlife, because you can zoom in without having to change your position, so you will be less likely to scare the animal away.
The best way to decide which type of lens is right for you is to ask yourself what type of photography you are going to be doing. If you are going to be photographing a scene which remains still, such as a landscape scene, then a prime lens could be a good choice. If on the other hand you want to photograph things that are moving, such as animals, people, or sports photography, then a zoom lens is a must.
So, you’re wanting to get a new lens, but you’re not quite sure whether to buy a prime lens or a zoom lens. Both types of lenses have their advantages and disadvantages, and you want to make sure you make the right decision and get the lens which best fits your photographic needs.
In case you didn't already know, the main difference between a zoom lens and prime lens is that a zoom lens enables you to adjust your focal length within a certain range (for example 18-50mm), whereas a prime lens has a fixed focal length.
So you might be wondering what the point is of using a prime lens. Surely if you have the choice between a lens with flexibility and one with no flexibility, then surely the flexible one is the best one, isn’t it? Well, it’s not really as straightforward as that, because prime lenses do have some advantages. To begin with, they are lighter than zoom lenses because they have less moving parts. Mechanically speaking, they are simpler.
In addition to this, prime lenses usually have wider apertures. The aperture of a lens determines how much light the lens lets in at any one time. Aperture ratings are in ratios, for example 1:3.5 or 1:2.8, but usually when buying a lens you will see it shown without the 1 in front of it, for example 3.5. Lenses with lower aperture numbers are more expensive, as a lower number means a wider aperture. Having a wide aperture produces a shallow depth of field, meaning that only a small distance range is in focus. A narrow depth of field (a wide aperture) would be great for close-ups of flowers where you want the background blurred, whereas a large depth-of-field (a small aperture) would be ideal for landscape photos.
Okay, so how about the zoom lens?
Well, a zoom lens will give you a bigger range of distances to compose your image. This means that you don't need to move closer or further away from your subject to get the picture you're after. It can also be great for taking shots of wildlife, because you can zoom in without having to change your position, so you will be less likely to scare the animal away.
The best way to decide which type of lens is right for you is to ask yourself what type of photography you are going to be doing. If you are going to be photographing a scene which remains still, such as a landscape scene, then a prime lens could be a good choice. If on the other hand you want to photograph things that are moving, such as animals, people, or sports photography, then a zoom lens is a must.
It’s not always easy trying to make this kind of decision, but whatever you decide, a Canon EF 85mm or a Nikon 17-55mm 2.8 Lens are good examples of the type of lenses that will always be useful to have as part of your photography kit.
About the Author
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Frequently Asked Questions...
comparing 2 Canon lenses, L lens with f/4 or regular with f/2.8?
Canon EF 17-40mm f/4.0 L USM Lens or Canon EF-S 17-55mm f/2.8 IS USM Lens?
The 17-40 is a L lens but it has f/4.0 and the 17-55 is regular but has f/2.8
Which one is better? if you were me which one you would get?
here are the links
http://www.the-digital-picture.com/Reviews/Canon-EF-17-40mm-f-4.0-L-USM-Lens-Review.aspx
http://www.the-digital-picture.com/Reviews/Canon-EF-S-17-55mm-f-2.8-IS-USM-Lens-Review.aspx
Thank you.
Answer:
The EF 17-40mm is designed for full-frame Canon dslrs. On a full-frame camera, the lens is a wide-angle to near-normal lens. If you use this lens on a aps-c crop camera, the lens is no longer really wide, doesn't reach far enough into telephoto, and is just really limited in terms of usability in most circumstances.
The 17-55mm f/2.8, on the other hand, is designed for use on aps-c crop cameras such as the Rebels, 40D and 50D. Because of the crop factor of 1.6, 17 is only moderately wide, while 55 is short telephoto. Because the lens is EF-S, the lens will not work on Canon's full frame cameras such as the 5D/1D cameras.
If you own a full-frame camera and need wide-angle, get the 17-40mm. If you own a aps-c crop camera, get the 17-55mm f/2.8 for day-to-day use. It's f/2.8 rating is also a stop faster than f/4, or about double the shutter speed.